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My RF 28mm f2.8 STM Arrived Today!

  
 
snegron7
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p.1 #1 · p.1 #1 · My RF 28mm f2.8 STM Arrived Today!


My RF 28mm f2.8 STM arrived today. I took a few test shots with it, and so far it seems pretty decent. It has better edge-to-edge sharpness than I expected. It seems to be on par with the Canon RF 16mm f2.8, but little to no edge distortion. It seems like a nice travel lens thanks to its light weight and somewhat thin profile.




Jul 09, 2023 at 12:39 PM
netexpress
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p.1 #2 · p.1 #2 · My RF 28mm f2.8 STM Arrived Today!


Thanks - mine should arrive late Monday.


Jul 09, 2023 at 07:49 PM
rscheffler
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p.1 #3 · p.1 #3 · My RF 28mm f2.8 STM Arrived Today!


snegron7 wrote:
My RF 28mm f2.8 STM arrived today. I took a few test shots with it, and so far it seems pretty decent. It has better edge-to-edge sharpness than I expected. It seems to be on par with the Canon RF 16mm f2.8, but little to no edge distortion. It seems like a nice travel lens thanks to its light weight and somewhat thin profile.



By edge distortion, were you referring to images with corrections disabled (like in a raw converter that allows this), or just less smearing at the edges in default corrected images than the 16? I find the 16mm 'acceptable' but would prefer better peripheral performance. With the 28 I would really want better peripheral performance (better sharpness, no signs of smearing due to software corrections) than the 16.

Would be nice if we can get some higher resolution images to pixel peep.



Jul 09, 2023 at 10:02 PM
leftymgp
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p.1 #4 · p.1 #4 · My RF 28mm f2.8 STM Arrived Today!


Picked up mine today as well. Hopefully I'll have some shots worth sharing pretty soon.


Jul 09, 2023 at 10:07 PM
snegron7
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p.1 #5 · p.1 #5 · My RF 28mm f2.8 STM Arrived Today!




rscheffler wrote:
By edge distortion, were you referring to images with corrections disabled (like in a raw converter that allows this), or just less smearing at the edges in default corrected images than the 16? I find the 16mm 'acceptable' but would prefer better peripheral performance. With the 28 I would really want better peripheral performance (better sharpness, no signs of smearing due to software corrections) than the 16.

Would be nice if we can get some higher resolution images to pixel peep.


Smearing in the default jpeg images; images show almost no distortion.



Jul 09, 2023 at 10:43 PM
jgoetz4
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p.1 #6 · p.1 #6 · My RF 28mm f2.8 STM Arrived Today!


Pictures please
Jim



Jul 10, 2023 at 05:21 PM
rscheffler
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p.1 #7 · p.1 #7 · My RF 28mm f2.8 STM Arrived Today!


The Digital Picture has test chart results, vignetting and distortion now posted on their RF 28 STM page.

After comparing against a few 28mm lenses from Canon, the Sigma 28 Art and Sony 28/2, looks like this STM will hold its own, in respect to sharpness. It's comparable to the EF 28/2.8 IS and better than the old EF 28/2.8. Peripheral sharpness is surprisingly as good or better than other 28s. Distortion, while not mild, is not crazy either, like the 16, which likely goes a long way towards retaining peripheral fine detail sharpness. Its uncorrected distortion is also less severe than the 24/1.8 and much less severe than the 24-105 STM, 24-50 and 24-240. It would probably be usable without distortion correction for scenes without obvious geometric content that would reveal its barrel distortion, assuming uncorrected images have even better peripheral sharpness, which should be the case.

I would still like to see real world, farther distance across-frame performance. TDP's test chart is likely quite close to the camera and the lens's results at this distance may not mean it performs similarly at or near infinity.



Jul 11, 2023 at 03:46 PM
johnctharp
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p.1 #8 · p.1 #8 · My RF 28mm f2.8 STM Arrived Today!


jgoetz4 wrote:
Pictures please
Jim


Seconded!

Why is there a thread about people having it and not one single cat picture?

rscheffler wrote:
After comparing against a few 28mm lenses from Canon, the Sigma 28 Art and Sony 28/2, looks like this STM will hold its own, in respect to sharpness. It's comparable to the EF 28/2.8 IS and better than the old EF 28/2.8. Peripheral sharpness is surprisingly as good or better than other 28s. Distortion, while not mild, is not crazy either, like the 16, which likely goes a long way towards retaining peripheral fine detail sharpness. Its uncorrected distortion is also less severe than the 24/1.8 and much less severe than the 24-105 STM, 24-50 and 24-240. It would probably
...Show more

Being comparable to the 28/2.8 IS is an achievement, given that the RF 28/2.8 STM is a 'lower rent' option relatively speaking. Like the other pancakes for various systems that Canon has produced, one can usually just set the camera to shutter priority and go to town (literally, go to town to take pictures!).

rscheffler wrote:
I would still like to see real world, farther distance across-frame performance. TDP's test chart is likely quite close to the camera and the lens's results at this distance may not mean it performs similarly at or near infinity.


If it has at least decent distant to infinity performance and reasonable field flatness, could see this being useful especially for minimalist landscape/cityscape loadouts.



Jul 11, 2023 at 10:14 PM
Pixelpuffin
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p.1 #9 · p.1 #9 · My RF 28mm f2.8 STM Arrived Today!


Is it true that the internal lenses are plastic?
I still can’t get over just how tiny the front element is.



Jul 12, 2023 at 06:20 AM
Gunzorro
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p.1 #10 · p.1 #10 · My RF 28mm f2.8 STM Arrived Today!


I will certainly pick up the RF 28 STM eventually.

I am impressed (quite a bit, actually) with the RF 50 STM. I think it is the best budget 50 Canon has ever produced, at least going back to the FD 50/1.8.

And I agree that the RF 16 STM has rather poor edges and corners until small apertures, but the mid-and-central image is extremely sharp near wide-open. Slightly cropped it is a great hiking lens.




Jul 12, 2023 at 08:47 AM
 


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rscheffler
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p.1 #11 · p.1 #11 · My RF 28mm f2.8 STM Arrived Today!


The Canon Europe RF 28 specs page states three "special optics" - PMo (plastic molded aspherical). Some info about PMo is on this page about Canon's various technologies.




Jul 12, 2023 at 08:54 AM
Toothwalker
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p.1 #12 · p.1 #12 · My RF 28mm f2.8 STM Arrived Today!


rscheffler wrote:
I would still like to see real world, farther distance across-frame performance. TDP's test chart is likely quite close to the camera and the lens's results at this distance may not mean it performs similarly at or near infinity.


It was delivered today, and I took two shots from my balcony with the 6D Mk2: one at f/2.8 and one at f/5.6.

Lightroom already has the lens profile, which was applied. Otherwise the only processing is mild sharpening.

F/5.6 is all I care about for distant scenes. It is not bad at all. In fact, I think we are seeing very good performance for such a small and lightweight lens.

The bajonet is a tight fit on my camera. I need noticeably more force to mount and unmount this lens than with my other RF lenses. I am not sure whether that is a property of this lens or just my specific sample.

I won't do any further testing, as I leave on vacation tomorrow. This weight saver was delivered just in time.





Jul 12, 2023 at 09:38 AM
rscheffler
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p.1 #13 · p.1 #13 · My RF 28mm f2.8 STM Arrived Today!


Toothwalker wrote:
It was delivered today, and I took two shots from my balcony with the 6D Mk2:


Thanks for these! I presume you meant to write R6 Mk2?

Yes, the overall sharpness is very good and nothing to complain about, as far as I can see.


rscheffler wrote:
The Canon Europe RF 28 specs page states three "special optics" - PMo (plastic molded aspherical). Some info about PMo is on this page about Canon's various technologies.



The Canon Japan RF 28 page has the block diagram:










Jul 12, 2023 at 09:46 AM
Toothwalker
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p.1 #14 · p.1 #14 · My RF 28mm f2.8 STM Arrived Today!


rscheffler wrote:
Thanks for these! I presume you meant to write R6 Mk2?


Indeed. Old habits die hard.


Yes, the overall sharpness is very good and nothing to complain about as far as I can see (extreme corner softness, but I'll take it).

The Canon Japan RF 28 page has the block diagram:
https://cweb.canon.jp/eos/rf/lineup/rf28-f28/image/spec/spec-lens-construction.jpg


An interesting design for sure, that manages to keep the lens compact while maintaining reasonable incident angles of the light hitting the sensor. There could be more to come on this front.



Jul 12, 2023 at 10:33 AM
AmbientMike
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p.1 #15 · p.1 #15 · My RF 28mm f2.8 STM Arrived Today!


Any idea on the uncorrected distortion percentage of the lens? Vignetting?


Jul 12, 2023 at 11:12 AM
Pixelpuffin
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p.1 #16 · p.1 #16 · My RF 28mm f2.8 STM Arrived Today!


Really stupid question
But won’t the plastic lenses turn orange over time? I have some old reading glasses that had plastic lenses, they have a distinct orange tint.

Tbh
I had pined so much for a RF pancake, I’m now left a little deflated. The front element is way too tiny to clean effectively, add the plastic elements and then the fairly steep price. By comparison the RF 50 is half the price, all glass, and bright too. I honestly thought it would very similar to the RF just a fraction slimmer.
In the UK the new 28 is around £350 ish, can’t help but think it’s not very good value.



Jul 12, 2023 at 01:25 PM
johnctharp
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p.1 #17 · p.1 #17 · My RF 28mm f2.8 STM Arrived Today!


If the plastic elements degrade, this would be a very poor move by Canon - and would also be uncharacteristic of Canon.

I wouldn't put much stock into that worry.



Jul 12, 2023 at 01:50 PM
lighthound
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p.1 #18 · p.1 #18 · My RF 28mm f2.8 STM Arrived Today!


johnctharp wrote:
If the plastic elements degrade, this would be a very poor move by Canon - and would also be uncharacteristic of Canon.

I wouldn't put much stock into that worry.


But just think of the beautiful warm glow it would give our images! No need for warming filters.

Agree that this is of little concern. But honestly, even if they did 10-15 years down the road, who really cares? Toss it in the trash and go buy another one for less than $299.
Just like we have to do with our $2k-$4k big screen OLED TV's after they crap out in 10 years or so.



Jul 12, 2023 at 02:25 PM
bcguy
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p.1 #19 · p.1 #19 · My RF 28mm f2.8 STM Arrived Today!


Pixelpuffin wrote:
Really stupid question
But won’t the plastic lenses turn orange over time? I have some old reading glasses that had plastic lenses, they have a distinct orange tint.

Tbh
I had pined so much for a RF pancake, I’m now left a little deflated. The front element is way too tiny to clean effectively, add the plastic elements and then the fairly steep price. By comparison the RF 50 is half the price, all glass, and bright too. I honestly thought it would very similar to the RF just a fraction slimmer.
In the UK the new 28 is around £350 ish, can’t help
...Show more

Not necessarily. I've worn glasses with plastic lenses for most of my life. They've never discoloured.



Jul 12, 2023 at 03:06 PM
snegron7
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p.1 #20 · p.1 #20 · My RF 28mm f2.8 STM Arrived Today!




Pixelpuffin wrote:
Really stupid question
But won’t the plastic lenses turn orange over time? I have some old reading glasses that had plastic lenses, they have a distinct orange tint.

Tbh
I had pined so much for a RF pancake, I’m now left a little deflated. The front element is way too tiny to clean effectively, add the plastic elements and then the fairly steep price. By comparison the RF 50 is half the price, all glass, and bright too. I honestly thought it would very similar to the RF just a fraction slimmer.
In the UK the new 28 is around £350 ish, can’t help
...Show more

I share your concerns about the use of plastic elements. Many years ago I purchased a Nikon 35mm f2.0 Series E. It was super clear and sharp for around 5 years or so, then the plastic elements started to fade; had a "frosty" appearance.

Hopefully this won't happen with my RF 28 as plastics technology has improved over the years.



Jul 12, 2023 at 05:23 PM
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